driver.c

hostapd源代码

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_FLUSH;
	return hostapd_ioctl(drv, &param, sizeof(param));
}


static int hostap_read_sta_data(void *priv,
				struct hostap_sta_driver_data *data,
				const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	char buf[1024], line[128], *pos;
	FILE *f;
	unsigned long val;

	memset(data, 0, sizeof(*data));
	snprintf(buf, sizeof(buf), "/proc/net/hostap/%s/" MACSTR,
		 drv->iface, MAC2STR(addr));

	f = fopen(buf, "r");
	if (!f)
		return -1;
	/* Need to read proc file with in one piece, so use large enough
	 * buffer. */
	setbuffer(f, buf, sizeof(buf));

	while (fgets(line, sizeof(line), f)) {
		pos = strchr(line, '=');
		if (!pos)
			continue;
		*pos++ = '\0';
		val = strtoul(pos, NULL, 10);
		if (strcmp(line, "rx_packets") == 0)
			data->rx_packets = val;
		else if (strcmp(line, "tx_packets") == 0)
			data->tx_packets = val;
		else if (strcmp(line, "rx_bytes") == 0)
			data->rx_bytes = val;
		else if (strcmp(line, "tx_bytes") == 0)
			data->tx_bytes = val;
	}

	fclose(f);

	return 0;
}


static int hostap_sta_add(const char *ifname, void *priv, const u8 *addr,
			  u16 aid, u16 capability, u8 *supp_rates,
			  size_t supp_rates_len, int flags)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;
	int tx_supp_rates = 0, i;

#define WLAN_RATE_1M BIT(0)
#define WLAN_RATE_2M BIT(1)
#define WLAN_RATE_5M5 BIT(2)
#define WLAN_RATE_11M BIT(3)

	for (i = 0; i < supp_rates_len; i++) {
		if ((supp_rates[i] & 0x7f) == 2)
			tx_supp_rates |= WLAN_RATE_1M;
		if ((supp_rates[i] & 0x7f) == 4)
			tx_supp_rates |= WLAN_RATE_2M;
		if ((supp_rates[i] & 0x7f) == 11)
			tx_supp_rates |= WLAN_RATE_5M5;
		if ((supp_rates[i] & 0x7f) == 22)
			tx_supp_rates |= WLAN_RATE_11M;
	}

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_ADD_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	param.u.add_sta.aid = aid;
	param.u.add_sta.capability = capability;
	param.u.add_sta.tx_supp_rates = tx_supp_rates;
	return hostapd_ioctl(drv, &param, sizeof(param));
}


static int hostap_sta_remove(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	hostap_sta_set_flags(drv, addr, 0, ~WLAN_STA_AUTHORIZED);

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_REMOVE_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		printf("Could not remove station from kernel driver.\n");
		return -1;
	}
	return 0;
}


static int hostap_get_inact_sec(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_GET_INFO_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		return -1;
	}

	return param.u.get_info_sta.inactive_sec;
}


static int hostap_sta_clear_stats(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_STA_CLEAR_STATS;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		return -1;
	}

	return 0;
}


static int hostap_set_assoc_ap(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_SET_ASSOC_AP_ADDR;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param)))
		return -1;

	return 0;
}


static int hostap_set_generic_elem(void *priv,
				   const u8 *elem, size_t elem_len)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param *param;
	int res;
	size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + elem_len;
	if (blen < sizeof(*param))
		blen = sizeof(*param);

	param = wpa_zalloc(blen);
	if (param == NULL)
		return -1;

	param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
	param->u.generic_elem.len = elem_len;
	memcpy(param->u.generic_elem.data, elem, elem_len);
	res = hostapd_ioctl(drv, param, blen);

	free(param);

	return res;
}


static void
hostapd_wireless_event_wireless_custom(struct hostap_driver_data *drv,
				       char *custom)
{
	struct hostapd_data *hapd = drv->hapd;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Custom wireless event: '%s'\n",
		      custom);

	if (strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
		char *pos;
		u8 addr[ETH_ALEN];
		pos = strstr(custom, "addr=");
		if (pos == NULL) {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "MLME-MICHAELMICFAILURE.indication "
				      "without sender address ignored\n");
			return;
		}
		pos += 5;
		if (hwaddr_aton(pos, addr) == 0) {
			ieee80211_michael_mic_failure(drv->hapd, addr, 1);
		} else {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "MLME-MICHAELMICFAILURE.indication "
				      "with invalid MAC address");
		}
	}
}


static void hostapd_wireless_event_wireless(struct hostap_driver_data *drv,
					    char *data, int len)
{
	struct hostapd_data *hapd = drv->hapd;
	struct iw_event iwe_buf, *iwe = &iwe_buf;
	char *pos, *end, *custom, *buf;

	pos = data;
	end = data + len;

	while (pos + IW_EV_LCP_LEN <= end) {
		/* Event data may be unaligned, so make a local, aligned copy
		 * before processing. */
		memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE, "Wireless event: "
			      "cmd=0x%x len=%d\n", iwe->cmd, iwe->len);
		if (iwe->len <= IW_EV_LCP_LEN)
			return;

		custom = pos + IW_EV_POINT_LEN;
		if (drv->we_version > 18 &&
		    (iwe->cmd == IWEVMICHAELMICFAILURE ||
		     iwe->cmd == IWEVCUSTOM)) {
			/* WE-19 removed the pointer from struct iw_point */
			char *dpos = (char *) &iwe_buf.u.data.length;
			int dlen = dpos - (char *) &iwe_buf;
			memcpy(dpos, pos + IW_EV_LCP_LEN,
			       sizeof(struct iw_event) - dlen);
		} else {
			memcpy(&iwe_buf, pos, sizeof(struct iw_event));
			custom += IW_EV_POINT_OFF;
		}

		switch (iwe->cmd) {
		case IWEVCUSTOM:
			if (custom + iwe->u.data.length > end)
				return;
			buf = malloc(iwe->u.data.length + 1);
			if (buf == NULL)
				return;
			memcpy(buf, custom, iwe->u.data.length);
			buf[iwe->u.data.length] = '\0';
			hostapd_wireless_event_wireless_custom(drv, buf);
			free(buf);
			break;
		}

		pos += iwe->len;
	}
}


static void hostapd_wireless_event_rtm_newlink(struct hostap_driver_data *drv,
					       struct nlmsghdr *h, int len)
{
	struct ifinfomsg *ifi;
	int attrlen, nlmsg_len, rta_len;
	struct rtattr * attr;

	if (len < sizeof(*ifi))
		return;

	ifi = NLMSG_DATA(h);

	/* TODO: use ifi->ifi_index to filter out wireless events from other
	 * interfaces */

	nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));

	attrlen = h->nlmsg_len - nlmsg_len;
	if (attrlen < 0)
		return;

	attr = (struct rtattr *) (((char *) ifi) + nlmsg_len);

	rta_len = RTA_ALIGN(sizeof(struct rtattr));
	while (RTA_OK(attr, attrlen)) {
		if (attr->rta_type == IFLA_WIRELESS) {
			hostapd_wireless_event_wireless(
				drv, ((char *) attr) + rta_len,
				attr->rta_len - rta_len);
		}
		attr = RTA_NEXT(attr, attrlen);
	}
}


static void hostapd_wireless_event_receive(int sock, void *eloop_ctx,
					   void *sock_ctx)
{
	char buf[256];
	int left;
	struct sockaddr_nl from;
	socklen_t fromlen;
	struct nlmsghdr *h;
	struct hostap_driver_data *drv = eloop_ctx;

	fromlen = sizeof(from);
	left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
			(struct sockaddr *) &from, &fromlen);
	if (left < 0) {
		if (errno != EINTR && errno != EAGAIN)
			perror("recvfrom(netlink)");
		return;
	}

	h = (struct nlmsghdr *) buf;
	while (left >= sizeof(*h)) {
		int len, plen;

		len = h->nlmsg_len;
		plen = len - sizeof(*h);
		if (len > left || plen < 0) {
			printf("Malformed netlink message: "
			       "len=%d left=%d plen=%d\n",
			       len, left, plen);
			break;
		}

		switch (h->nlmsg_type) {
		case RTM_NEWLINK:
			hostapd_wireless_event_rtm_newlink(drv, h, plen);
			break;
		}

		len = NLMSG_ALIGN(len);
		left -= len;
		h = (struct nlmsghdr *) ((char *) h + len);
	}

	if (left > 0) {
		printf("%d extra bytes in the end of netlink message\n", left);
	}
}


static int hostap_get_we_version(struct hostap_driver_data *drv)
{
	struct iw_range *range;
	struct iwreq iwr;
	int minlen;
	size_t buflen;

	drv->we_version = 0;

	/*
	 * Use larger buffer than struct iw_range in order to allow the
	 * structure to grow in the future.
	 */
	buflen = sizeof(struct iw_range) + 500;
	range = wpa_zalloc(buflen);
	if (range == NULL)
		return -1;

	memset(&iwr, 0, sizeof(iwr));
	strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	iwr.u.data.pointer = (caddr_t) range;
	iwr.u.data.length = buflen;

	minlen = ((char *) &range->enc_capa) - (char *) range +
		sizeof(range->enc_capa);

	if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
		perror("ioctl[SIOCGIWRANGE]");
		free(range);
		return -1;
	} else if (iwr.u.data.length >= minlen &&
		   range->we_version_compiled >= 18) {
		wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
			   "WE(source)=%d enc_capa=0x%x",
			   range->we_version_compiled,
			   range->we_version_source,
			   range->enc_capa);
		drv->we_version = range->we_version_compiled;
	}

	free(range);
	return 0;
}


static int hostap_wireless_event_init(void *priv)
{
	struct hostap_driver_data *drv = priv;
	int s;
	struct sockaddr_nl local;

	hostap_get_we_version(drv);

	drv->wext_sock = -1;

	s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (s < 0) {
		perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
		return -1;
	}

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;
	local.nl_groups = RTMGRP_LINK;
	if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
		perror("bind(netlink)");
		close(s);
		return -1;
	}

	eloop_register_read_sock(s, hostapd_wireless_event_receive, drv,
				 NULL);
	drv->wext_sock = s;

	return 0;
}


static void hostap_wireless_event_deinit(void *priv)
{
	struct hostap_driver_data *drv = priv;
	if (drv->wext_sock < 0)
		return;
	eloop_unregister_read_sock(drv->wext_sock);
	close(drv->wext_sock);
}


static int hostap_init(struct hostapd_data *hapd)
{
	struct hostap_driver_data *drv;

	drv = wpa_zalloc(sizeof(struct hostap_driver_data));
	if (drv == NULL) {
		printf("Could not allocate memory for hostapd driver data\n");
		return -1;
	}

	drv->ops = hostap_driver_ops;
	drv->hapd = hapd;
	drv->ioctl_sock = drv->sock = -1;
	memcpy(drv->iface, hapd->conf->iface, sizeof(drv->iface));

	drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (drv->ioctl_sock < 0) {
		perror("socket[PF_INET,SOCK_DGRAM]");
		return -1;
	}

	if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 1)) {
		printf("Could not enable hostapd mode for interface %s\n",
		       drv->iface);
		return -1;
	}

	if (hapd->conf->assoc_ap &&
	    hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 1)) {
		printf("Could not enable hostapd STA mode for interface %s\n",
		       drv->iface);
		return -1;
	}

	if (hostap_init_sockets(drv))
		return -1;

	hapd->driver = &drv->ops;
	return 0;
}


static void hostap_driver_deinit(void *priv)
{
	struct hostap_driver_data *drv = priv;

	drv->hapd->driver = NULL;

	(void) hostap_set_iface_flags(drv, 0);
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 0);
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 0);

	if (drv->ioctl_sock >= 0)
		close(drv->ioctl_sock);

	if (drv->sock >= 0)
		close(drv->sock);
	
	free(drv);
}


static int hostap_sta_deauth(void *priv, const u8 *addr, int reason)
{
	struct hostap_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DEAUTH);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.deauth.reason_code = host_to_le16(reason);
	return hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				      sizeof(mgmt.u.deauth), 0);
}


static int hostap_sta_disassoc(void *priv, const u8 *addr, int reason)
{
	struct hostap_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DISASSOC);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.disassoc.reason_code = host_to_le16(reason);
	return  hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				       sizeof(mgmt.u.disassoc), 0);
}


static struct hostapd_hw_modes * hostap_get_hw_feature_data(void *priv,
							    u16 *num_modes,
							    u16 *flags)
{
	struct hostapd_hw_modes *mode;
	int i, clen, rlen;
	const short chan2freq[14] = {
		2412, 2417, 2422, 2427, 2432, 2437, 2442,
		2447, 2452, 2457, 2462, 2467, 2472, 2484
	};

	mode = wpa_zalloc(sizeof(struct hostapd_hw_modes));
	if (mode == NULL)
		return NULL;

	*num_modes = 1;
	*flags = 0;

	mode->mode = HOSTAPD_MODE_IEEE80211B;
	mode->num_channels = 14;
	mode->num_rates = 4;

	clen = mode->num_channels * sizeof(struct hostapd_channel_data);
	rlen = mode->num_rates * sizeof(struct hostapd_rate_data);

	mode->channels = wpa_zalloc(clen);
	mode->rates = wpa_zalloc(rlen);
	if (mode->channels == NULL || mode->rates == NULL) {
		hostapd_free_hw_features(mode, *num_modes);
		return NULL;
	}

	for (i = 0; i < 14; i++) {
		mode->channels[i].chan = i + 1;
		mode->channels[i].freq = chan2freq[i];
	}

	mode->rates[0].rate = 10;
	mode->rates[0].flags = HOSTAPD_RATE_CCK;
	mode->rates[1].rate = 20;
	mode->rates[1].flags = HOSTAPD_RATE_CCK;
	mode->rates[2].rate = 55;
	mode->rates[2].flags = HOSTAPD_RATE_CCK;
	mode->rates[3].rate = 110;
	mode->rates[3].flags = HOSTAPD_RATE_CCK;

	return mode;
}


static const struct driver_ops hostap_driver_ops = {
	.name = "hostap",
	.init = hostap_init,
	.deinit = hostap_driver_deinit,
	.wireless_event_init = hostap_wireless_event_init,
	.wireless_event_deinit = hostap_wireless_event_deinit,
	.set_ieee8021x = hostap_set_ieee8021x,
	.set_privacy = hostap_set_privacy,
	.set_encryption = hostap_set_encryption,
	.get_seqnum = hostap_get_seqnum,
	.flush = hostap_flush,
	.set_generic_elem = hostap_set_generic_elem,
	.read_sta_data = hostap_read_sta_data,
	.send_eapol = hostap_send_eapol,
	.sta_set_flags = hostap_sta_set_flags,
	.sta_deauth = hostap_sta_deauth,
	.sta_disassoc = hostap_sta_disassoc,
	.sta_remove = hostap_sta_remove,
	.set_ssid = hostap_set_ssid,
	.send_mgmt_frame = hostap_send_mgmt_frame,
	.set_assoc_ap = hostap_set_assoc_ap,
	.sta_add = hostap_sta_add,
	.get_inact_sec = hostap_get_inact_sec,
	.sta_clear_stats = hostap_sta_clear_stats,
	.get_hw_feature_data = hostap_get_hw_feature_data,
};


void hostap_driver_register(void)
{
	driver_register(hostap_driver_ops.name, &hostap_driver_ops);
}